What does the ->(M) mean on the 3818A Ord serial Number?

Private Squirrel's picture

Hi :)

I am sorry another question about the Bulova Military Mil-W-3818A.

I am not sure what the letter (M) in the brackets might mean?

And also the letter -A- in the Serial number?

Hear is the Details-

MIL-W-3818A, Serial  No.A 17272,  AF Stock No. 6645-808-1407, Bulova Stock No. 10 BNCH. Cont. No. DA-36-038-ord-2150(M).  U.S. Case

Thanks so much

:)